4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
12 * device attached, a scsi_device is allocated and setup for it.
14 * For every id of every channel on the given host:
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
19 * If LUN 0 has a device attached, allocate and setup a
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/blkdev.h>
32 #include <linux/delay.h>
33 #include <linux/kthread.h>
34 #include <linux/spinlock.h>
35 #include <linux/async.h>
36 #include <linux/slab.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_driver.h>
42 #include <scsi/scsi_devinfo.h>
43 #include <scsi/scsi_host.h>
44 #include <scsi/scsi_transport.h>
45 #include <scsi/scsi_eh.h>
47 #include "scsi_priv.h"
48 #include "scsi_logging.h"
50 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
51 " SCSI scanning, some SCSI devices might not be configured\n"
56 #define SCSI_TIMEOUT (2*HZ)
59 * Prefix values for the SCSI id's (stored in sysfs name field)
61 #define SCSI_UID_SER_NUM 'S'
62 #define SCSI_UID_UNKNOWN 'Z'
65 * Return values of some of the scanning functions.
67 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
68 * includes allocation or general failures preventing IO from being sent.
70 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
73 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
76 #define SCSI_SCAN_NO_RESPONSE 0
77 #define SCSI_SCAN_TARGET_PRESENT 1
78 #define SCSI_SCAN_LUN_PRESENT 2
80 static const char *scsi_null_device_strs = "nullnullnullnull";
82 #define MAX_SCSI_LUNS 512
84 #ifdef CONFIG_SCSI_MULTI_LUN
85 static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
87 static unsigned int max_scsi_luns = 1;
90 module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
91 MODULE_PARM_DESC(max_luns,
92 "last scsi LUN (should be between 1 and 2^32-1)");
94 #ifdef CONFIG_SCSI_SCAN_ASYNC
95 #define SCSI_SCAN_TYPE_DEFAULT "async"
97 #define SCSI_SCAN_TYPE_DEFAULT "sync"
100 static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
102 module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
103 MODULE_PARM_DESC(scan, "sync, async or none");
106 * max_scsi_report_luns: the maximum number of LUNS that will be
107 * returned from the REPORT LUNS command. 8 times this value must
108 * be allocated. In theory this could be up to an 8 byte value, but
109 * in practice, the maximum number of LUNs suppored by any device
112 static unsigned int max_scsi_report_luns = 511;
114 module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
115 MODULE_PARM_DESC(max_report_luns,
116 "REPORT LUNS maximum number of LUNS received (should be"
117 " between 1 and 16384)");
119 static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
121 module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
122 MODULE_PARM_DESC(inq_timeout,
123 "Timeout (in seconds) waiting for devices to answer INQUIRY."
124 " Default is 20. Some devices may need more; most need less.");
126 /* This lock protects only this list */
127 static DEFINE_SPINLOCK(async_scan_lock);
128 static LIST_HEAD(scanning_hosts);
130 struct async_scan_data {
131 struct list_head list;
132 struct Scsi_Host *shost;
133 struct completion prev_finished;
137 * scsi_complete_async_scans - Wait for asynchronous scans to complete
139 * When this function returns, any host which started scanning before
140 * this function was called will have finished its scan. Hosts which
141 * started scanning after this function was called may or may not have
144 int scsi_complete_async_scans(void)
146 struct async_scan_data *data;
149 if (list_empty(&scanning_hosts))
151 /* If we can't get memory immediately, that's OK. Just
152 * sleep a little. Even if we never get memory, the async
153 * scans will finish eventually.
155 data = kmalloc(sizeof(*data), GFP_KERNEL);
161 init_completion(&data->prev_finished);
163 spin_lock(&async_scan_lock);
164 /* Check that there's still somebody else on the list */
165 if (list_empty(&scanning_hosts))
167 list_add_tail(&data->list, &scanning_hosts);
168 spin_unlock(&async_scan_lock);
170 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
171 wait_for_completion(&data->prev_finished);
173 spin_lock(&async_scan_lock);
174 list_del(&data->list);
175 if (!list_empty(&scanning_hosts)) {
176 struct async_scan_data *next = list_entry(scanning_hosts.next,
177 struct async_scan_data, list);
178 complete(&next->prev_finished);
181 spin_unlock(&async_scan_lock);
188 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
189 * @sdev: scsi device to send command to
190 * @result: area to store the result of the MODE SENSE
193 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
194 * Called for BLIST_KEY devices.
196 static void scsi_unlock_floptical(struct scsi_device *sdev,
197 unsigned char *result)
199 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
201 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
202 scsi_cmd[0] = MODE_SENSE;
206 scsi_cmd[4] = 0x2a; /* size */
208 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
209 SCSI_TIMEOUT, 3, NULL);
213 * scsi_alloc_sdev - allocate and setup a scsi_Device
214 * @starget: which target to allocate a &scsi_device for
216 * @hostdata: usually NULL and set by ->slave_alloc instead
219 * Allocate, initialize for io, and return a pointer to a scsi_Device.
220 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
221 * adds scsi_Device to the appropriate list.
224 * scsi_Device pointer, or NULL on failure.
226 static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
227 unsigned int lun, void *hostdata)
229 struct scsi_device *sdev;
230 int display_failure_msg = 1, ret;
231 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
232 extern void scsi_evt_thread(struct work_struct *work);
233 extern void scsi_requeue_run_queue(struct work_struct *work);
235 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
240 sdev->vendor = scsi_null_device_strs;
241 sdev->model = scsi_null_device_strs;
242 sdev->rev = scsi_null_device_strs;
244 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
245 sdev->id = starget->id;
247 sdev->channel = starget->channel;
248 sdev->sdev_state = SDEV_CREATED;
249 INIT_LIST_HEAD(&sdev->siblings);
250 INIT_LIST_HEAD(&sdev->same_target_siblings);
251 INIT_LIST_HEAD(&sdev->cmd_list);
252 INIT_LIST_HEAD(&sdev->starved_entry);
253 INIT_LIST_HEAD(&sdev->event_list);
254 spin_lock_init(&sdev->list_lock);
255 INIT_WORK(&sdev->event_work, scsi_evt_thread);
256 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
258 sdev->sdev_gendev.parent = get_device(&starget->dev);
259 sdev->sdev_target = starget;
261 /* usually NULL and set by ->slave_alloc instead */
262 sdev->hostdata = hostdata;
264 /* if the device needs this changing, it may do so in the
265 * slave_configure function */
266 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
269 * Some low level driver could use device->type
274 * Assume that the device will have handshaking problems,
275 * and then fix this field later if it turns out it
280 sdev->request_queue = scsi_alloc_queue(sdev);
281 if (!sdev->request_queue) {
282 /* release fn is set up in scsi_sysfs_device_initialise, so
283 * have to free and put manually here */
284 put_device(&starget->dev);
288 WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
289 sdev->request_queue->queuedata = sdev;
290 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
292 scsi_sysfs_device_initialize(sdev);
294 if (shost->hostt->slave_alloc) {
295 ret = shost->hostt->slave_alloc(sdev);
298 * if LLDD reports slave not present, don't clutter
299 * console with alloc failure messages
302 display_failure_msg = 0;
303 goto out_device_destroy;
310 __scsi_remove_device(sdev);
312 if (display_failure_msg)
313 printk(ALLOC_FAILURE_MSG, __func__);
317 static void scsi_target_destroy(struct scsi_target *starget)
319 struct device *dev = &starget->dev;
320 struct Scsi_Host *shost = dev_to_shost(dev->parent);
323 starget->state = STARGET_DEL;
324 transport_destroy_device(dev);
325 spin_lock_irqsave(shost->host_lock, flags);
326 if (shost->hostt->target_destroy)
327 shost->hostt->target_destroy(starget);
328 list_del_init(&starget->siblings);
329 spin_unlock_irqrestore(shost->host_lock, flags);
333 static void scsi_target_dev_release(struct device *dev)
335 struct device *parent = dev->parent;
336 struct scsi_target *starget = to_scsi_target(dev);
342 static struct device_type scsi_target_type = {
343 .name = "scsi_target",
344 .release = scsi_target_dev_release,
347 int scsi_is_target_device(const struct device *dev)
349 return dev->type == &scsi_target_type;
351 EXPORT_SYMBOL(scsi_is_target_device);
353 static struct scsi_target *__scsi_find_target(struct device *parent,
354 int channel, uint id)
356 struct scsi_target *starget, *found_starget = NULL;
357 struct Scsi_Host *shost = dev_to_shost(parent);
359 * Search for an existing target for this sdev.
361 list_for_each_entry(starget, &shost->__targets, siblings) {
362 if (starget->id == id &&
363 starget->channel == channel) {
364 found_starget = starget;
369 get_device(&found_starget->dev);
371 return found_starget;
375 * scsi_target_reap_ref_release - remove target from visibility
376 * @kref: the reap_ref in the target being released
378 * Called on last put of reap_ref, which is the indication that no device
379 * under this target is visible anymore, so render the target invisible in
380 * sysfs. Note: we have to be in user context here because the target reaps
381 * should be done in places where the scsi device visibility is being removed.
383 static void scsi_target_reap_ref_release(struct kref *kref)
385 struct scsi_target *starget
386 = container_of(kref, struct scsi_target, reap_ref);
389 * if we get here and the target is still in the CREATED state that
390 * means it was allocated but never made visible (because a scan
391 * turned up no LUNs), so don't call device_del() on it.
393 if (starget->state != STARGET_CREATED) {
394 transport_remove_device(&starget->dev);
395 device_del(&starget->dev);
397 scsi_target_destroy(starget);
400 static void scsi_target_reap_ref_put(struct scsi_target *starget)
402 kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
406 * scsi_alloc_target - allocate a new or find an existing target
407 * @parent: parent of the target (need not be a scsi host)
408 * @channel: target channel number (zero if no channels)
409 * @id: target id number
411 * Return an existing target if one exists, provided it hasn't already
412 * gone into STARGET_DEL state, otherwise allocate a new target.
414 * The target is returned with an incremented reference, so the caller
415 * is responsible for both reaping and doing a last put
417 static struct scsi_target *scsi_alloc_target(struct device *parent,
418 int channel, uint id)
420 struct Scsi_Host *shost = dev_to_shost(parent);
421 struct device *dev = NULL;
423 const int size = sizeof(struct scsi_target)
424 + shost->transportt->target_size;
425 struct scsi_target *starget;
426 struct scsi_target *found_target;
429 starget = kzalloc(size, GFP_KERNEL);
431 printk(KERN_ERR "%s: allocation failure\n", __func__);
435 device_initialize(dev);
436 kref_init(&starget->reap_ref);
437 dev->parent = get_device(parent);
438 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
439 dev->bus = &scsi_bus_type;
440 dev->type = &scsi_target_type;
442 starget->channel = channel;
443 starget->can_queue = 0;
444 INIT_LIST_HEAD(&starget->siblings);
445 INIT_LIST_HEAD(&starget->devices);
446 starget->state = STARGET_CREATED;
447 starget->scsi_level = SCSI_2;
448 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
450 spin_lock_irqsave(shost->host_lock, flags);
452 found_target = __scsi_find_target(parent, channel, id);
456 list_add_tail(&starget->siblings, &shost->__targets);
457 spin_unlock_irqrestore(shost->host_lock, flags);
458 /* allocate and add */
459 transport_setup_device(dev);
460 if (shost->hostt->target_alloc) {
461 error = shost->hostt->target_alloc(starget);
464 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
465 /* don't want scsi_target_reap to do the final
466 * put because it will be under the host lock */
467 scsi_target_destroy(starget);
477 * release routine already fired if kref is zero, so if we can still
478 * take the reference, the target must be alive. If we can't, it must
479 * be dying and we need to wait for a new target
481 ref_got = kref_get_unless_zero(&found_target->reap_ref);
483 spin_unlock_irqrestore(shost->host_lock, flags);
489 * Unfortunately, we found a dying target; need to wait until it's
490 * dead before we can get a new one. There is an anomaly here. We
491 * *should* call scsi_target_reap() to balance the kref_get() of the
492 * reap_ref above. However, since the target being released, it's
493 * already invisible and the reap_ref is irrelevant. If we call
494 * scsi_target_reap() we might spuriously do another device_del() on
495 * an already invisible target.
497 put_device(&found_target->dev);
499 * length of time is irrelevant here, we just want to yield the CPU
500 * for a tick to avoid busy waiting for the target to die.
507 * scsi_target_reap - check to see if target is in use and destroy if not
508 * @starget: target to be checked
510 * This is used after removing a LUN or doing a last put of the target
511 * it checks atomically that nothing is using the target and removes
514 void scsi_target_reap(struct scsi_target *starget)
517 * serious problem if this triggers: STARGET_DEL is only set in the if
518 * the reap_ref drops to zero, so we're trying to do another final put
519 * on an already released kref
521 BUG_ON(starget->state == STARGET_DEL);
522 scsi_target_reap_ref_put(starget);
526 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
527 * @s: INQUIRY result string to sanitize
528 * @len: length of the string
531 * The SCSI spec says that INQUIRY vendor, product, and revision
532 * strings must consist entirely of graphic ASCII characters,
533 * padded on the right with spaces. Since not all devices obey
534 * this rule, we will replace non-graphic or non-ASCII characters
535 * with spaces. Exception: a NUL character is interpreted as a
536 * string terminator, so all the following characters are set to
539 static void sanitize_inquiry_string(unsigned char *s, int len)
543 for (; len > 0; (--len, ++s)) {
546 if (terminated || *s < 0x20 || *s > 0x7e)
552 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
553 * @sdev: scsi_device to probe
554 * @inq_result: area to store the INQUIRY result
555 * @result_len: len of inq_result
556 * @bflags: store any bflags found here
559 * Probe the lun associated with @req using a standard SCSI INQUIRY;
561 * If the INQUIRY is successful, zero is returned and the
562 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
563 * are copied to the scsi_device any flags value is stored in *@bflags.
565 static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
566 int result_len, int *bflags)
568 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
569 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
570 int response_len = 0;
571 int pass, count, result;
572 struct scsi_sense_hdr sshdr;
576 /* Perform up to 3 passes. The first pass uses a conservative
577 * transfer length of 36 unless sdev->inquiry_len specifies a
578 * different value. */
579 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
580 try_inquiry_len = first_inquiry_len;
584 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
585 "scsi scan: INQUIRY pass %d length %d\n",
586 pass, try_inquiry_len));
588 /* Each pass gets up to three chances to ignore Unit Attention */
589 for (count = 0; count < 3; ++count) {
592 memset(scsi_cmd, 0, 6);
593 scsi_cmd[0] = INQUIRY;
594 scsi_cmd[4] = (unsigned char) try_inquiry_len;
596 memset(inq_result, 0, try_inquiry_len);
598 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
599 inq_result, try_inquiry_len, &sshdr,
600 HZ / 2 + HZ * scsi_inq_timeout, 3,
603 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
605 result ? "failed" : "successful", result));
609 * not-ready to ready transition [asc/ascq=0x28/0x0]
610 * or power-on, reset [asc/ascq=0x29/0x0], continue.
611 * INQUIRY should not yield UNIT_ATTENTION
612 * but many buggy devices do so anyway.
614 if ((driver_byte(result) & DRIVER_SENSE) &&
615 scsi_sense_valid(&sshdr)) {
616 if ((sshdr.sense_key == UNIT_ATTENTION) &&
617 ((sshdr.asc == 0x28) ||
618 (sshdr.asc == 0x29)) &&
624 * if nothing was transferred, we try
625 * again. It's a workaround for some USB
628 if (resid == try_inquiry_len)
635 sanitize_inquiry_string(&inq_result[8], 8);
636 sanitize_inquiry_string(&inq_result[16], 16);
637 sanitize_inquiry_string(&inq_result[32], 4);
639 response_len = inq_result[4] + 5;
640 if (response_len > 255)
641 response_len = first_inquiry_len; /* sanity */
644 * Get any flags for this device.
646 * XXX add a bflags to scsi_device, and replace the
647 * corresponding bit fields in scsi_device, so bflags
648 * need not be passed as an argument.
650 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
653 /* When the first pass succeeds we gain information about
654 * what larger transfer lengths might work. */
656 if (BLIST_INQUIRY_36 & *bflags)
657 next_inquiry_len = 36;
658 else if (BLIST_INQUIRY_58 & *bflags)
659 next_inquiry_len = 58;
660 else if (sdev->inquiry_len)
661 next_inquiry_len = sdev->inquiry_len;
663 next_inquiry_len = response_len;
665 /* If more data is available perform the second pass */
666 if (next_inquiry_len > try_inquiry_len) {
667 try_inquiry_len = next_inquiry_len;
673 } else if (pass == 2) {
674 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
675 "Consider BLIST_INQUIRY_36 for this device\n",
678 /* If this pass failed, the third pass goes back and transfers
679 * the same amount as we successfully got in the first pass. */
680 try_inquiry_len = first_inquiry_len;
685 /* If the last transfer attempt got an error, assume the
686 * peripheral doesn't exist or is dead. */
690 /* Don't report any more data than the device says is valid */
691 sdev->inquiry_len = min(try_inquiry_len, response_len);
694 * XXX Abort if the response length is less than 36? If less than
695 * 32, the lookup of the device flags (above) could be invalid,
696 * and it would be possible to take an incorrect action - we do
697 * not want to hang because of a short INQUIRY. On the flip side,
698 * if the device is spun down or becoming ready (and so it gives a
699 * short INQUIRY), an abort here prevents any further use of the
700 * device, including spin up.
702 * On the whole, the best approach seems to be to assume the first
703 * 36 bytes are valid no matter what the device says. That's
704 * better than copying < 36 bytes to the inquiry-result buffer
705 * and displaying garbage for the Vendor, Product, or Revision
708 if (sdev->inquiry_len < 36) {
709 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
710 " using 36\n", sdev->inquiry_len);
711 sdev->inquiry_len = 36;
715 * Related to the above issue:
717 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
718 * and if not ready, sent a START_STOP to start (maybe spin up) and
719 * then send the INQUIRY again, since the INQUIRY can change after
720 * a device is initialized.
722 * Ideally, start a device if explicitly asked to do so. This
723 * assumes that a device is spun up on power on, spun down on
724 * request, and then spun up on request.
728 * The scanning code needs to know the scsi_level, even if no
729 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
730 * non-zero LUNs can be scanned.
732 sdev->scsi_level = inq_result[2] & 0x07;
733 if (sdev->scsi_level >= 2 ||
734 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
736 sdev->sdev_target->scsi_level = sdev->scsi_level;
742 * scsi_add_lun - allocate and fully initialze a scsi_device
743 * @sdev: holds information to be stored in the new scsi_device
744 * @inq_result: holds the result of a previous INQUIRY to the LUN
745 * @bflags: black/white list flag
746 * @async: 1 if this device is being scanned asynchronously
749 * Initialize the scsi_device @sdev. Optionally set fields based
750 * on values in *@bflags.
753 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
754 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
756 static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
757 int *bflags, int async)
762 * XXX do not save the inquiry, since it can change underneath us,
763 * save just vendor/model/rev.
765 * Rather than save it and have an ioctl that retrieves the saved
766 * value, have an ioctl that executes the same INQUIRY code used
767 * in scsi_probe_lun, let user level programs doing INQUIRY
768 * scanning run at their own risk, or supply a user level program
769 * that can correctly scan.
773 * Copy at least 36 bytes of INQUIRY data, so that we don't
774 * dereference unallocated memory when accessing the Vendor,
775 * Product, and Revision strings. Badly behaved devices may set
776 * the INQUIRY Additional Length byte to a small value, indicating
777 * these strings are invalid, but often they contain plausible data
778 * nonetheless. It doesn't matter if the device sent < 36 bytes
779 * total, since scsi_probe_lun() initializes inq_result with 0s.
781 sdev->inquiry = kmemdup(inq_result,
782 max_t(size_t, sdev->inquiry_len, 36),
784 if (sdev->inquiry == NULL)
785 return SCSI_SCAN_NO_RESPONSE;
787 sdev->vendor = (char *) (sdev->inquiry + 8);
788 sdev->model = (char *) (sdev->inquiry + 16);
789 sdev->rev = (char *) (sdev->inquiry + 32);
791 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
793 * sata emulation layer device. This is a hack to work around
794 * the SATL power management specifications which state that
795 * when the SATL detects the device has gone into standby
796 * mode, it shall respond with NOT READY.
798 sdev->allow_restart = 1;
801 if (*bflags & BLIST_ISROM) {
802 sdev->type = TYPE_ROM;
805 sdev->type = (inq_result[0] & 0x1f);
806 sdev->removable = (inq_result[1] & 0x80) >> 7;
809 switch (sdev->type) {
817 case TYPE_MEDIUM_CHANGER:
829 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
832 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
833 /* RBC and MMC devices can return SCSI-3 compliance and yet
834 * still not support REPORT LUNS, so make them act as
835 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
836 * specifically set */
837 if ((*bflags & BLIST_REPORTLUN2) == 0)
838 *bflags |= BLIST_NOREPORTLUN;
842 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
843 * spec says: The device server is capable of supporting the
844 * specified peripheral device type on this logical unit. However,
845 * the physical device is not currently connected to this logical
848 * The above is vague, as it implies that we could treat 001 and
849 * 011 the same. Stay compatible with previous code, and create a
850 * scsi_device for a PQ of 1
852 * Don't set the device offline here; rather let the upper
853 * level drivers eval the PQ to decide whether they should
854 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
857 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
858 sdev->lockable = sdev->removable;
859 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
861 if (sdev->scsi_level >= SCSI_3 ||
862 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
864 if (inq_result[7] & 0x60)
866 if (inq_result[7] & 0x10)
869 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
870 "ANSI: %d%s\n", scsi_device_type(sdev->type),
871 sdev->vendor, sdev->model, sdev->rev,
872 sdev->inq_periph_qual, inq_result[2] & 0x07,
873 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
875 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
876 !(*bflags & BLIST_NOTQ))
877 sdev->tagged_supported = 1;
880 * Some devices (Texel CD ROM drives) have handshaking problems
881 * when used with the Seagate controllers. borken is initialized
882 * to 1, and then set it to 0 here.
884 if ((*bflags & BLIST_BORKEN) == 0)
887 if (*bflags & BLIST_NO_ULD_ATTACH)
888 sdev->no_uld_attach = 1;
891 * Apparently some really broken devices (contrary to the SCSI
892 * standards) need to be selected without asserting ATN
894 if (*bflags & BLIST_SELECT_NO_ATN)
895 sdev->select_no_atn = 1;
898 * Maximum 512 sector transfer length
899 * broken RA4x00 Compaq Disk Array
901 if (*bflags & BLIST_MAX_512)
902 blk_queue_max_hw_sectors(sdev->request_queue, 512);
905 * Some devices may not want to have a start command automatically
906 * issued when a device is added.
908 if (*bflags & BLIST_NOSTARTONADD)
909 sdev->no_start_on_add = 1;
911 if (*bflags & BLIST_SINGLELUN)
912 scsi_target(sdev)->single_lun = 1;
914 sdev->use_10_for_rw = 1;
916 if (*bflags & BLIST_MS_SKIP_PAGE_08)
917 sdev->skip_ms_page_8 = 1;
919 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
920 sdev->skip_ms_page_3f = 1;
922 if (*bflags & BLIST_USE_10_BYTE_MS)
923 sdev->use_10_for_ms = 1;
925 /* set the device running here so that slave configure
927 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
929 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
932 sdev_printk(KERN_ERR, sdev,
933 "in wrong state %s to complete scan\n",
934 scsi_device_state_name(sdev->sdev_state));
935 return SCSI_SCAN_NO_RESPONSE;
939 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
940 sdev->use_192_bytes_for_3f = 1;
942 if (*bflags & BLIST_NOT_LOCKABLE)
945 if (*bflags & BLIST_RETRY_HWERROR)
946 sdev->retry_hwerror = 1;
948 if (*bflags & BLIST_NO_DIF)
951 sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
953 if (*bflags & BLIST_TRY_VPD_PAGES)
954 sdev->try_vpd_pages = 1;
955 else if (*bflags & BLIST_SKIP_VPD_PAGES)
956 sdev->skip_vpd_pages = 1;
958 transport_configure_device(&sdev->sdev_gendev);
960 if (sdev->host->hostt->slave_configure) {
961 ret = sdev->host->hostt->slave_configure(sdev);
964 * if LLDD reports slave not present, don't clutter
965 * console with alloc failure messages
968 sdev_printk(KERN_ERR, sdev,
969 "failed to configure device\n");
971 return SCSI_SCAN_NO_RESPONSE;
975 sdev->max_queue_depth = sdev->queue_depth;
978 * Ok, the device is now all set up, we can
979 * register it and tell the rest of the kernel
982 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
983 return SCSI_SCAN_NO_RESPONSE;
985 return SCSI_SCAN_LUN_PRESENT;
988 #ifdef CONFIG_SCSI_LOGGING
990 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
991 * @buf: Output buffer with at least end-first+1 bytes of space
992 * @inq: Inquiry buffer (input)
993 * @first: Offset of string into inq
994 * @end: Index after last character in inq
996 static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
997 unsigned first, unsigned end)
999 unsigned term = 0, idx;
1001 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1002 if (inq[idx+first] > ' ') {
1003 buf[idx] = inq[idx+first];
1015 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1016 * @starget: pointer to target device structure
1017 * @lun: LUN of target device
1018 * @bflagsp: store bflags here if not NULL
1019 * @sdevp: probe the LUN corresponding to this scsi_device
1020 * @rescan: if nonzero skip some code only needed on first scan
1021 * @hostdata: passed to scsi_alloc_sdev()
1024 * Call scsi_probe_lun, if a LUN with an attached device is found,
1025 * allocate and set it up by calling scsi_add_lun.
1028 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1029 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1030 * attached at the LUN
1031 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1033 static int scsi_probe_and_add_lun(struct scsi_target *starget,
1034 uint lun, int *bflagsp,
1035 struct scsi_device **sdevp, int rescan,
1038 struct scsi_device *sdev;
1039 unsigned char *result;
1040 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
1041 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1044 * The rescan flag is used as an optimization, the first scan of a
1045 * host adapter calls into here with rescan == 0.
1047 sdev = scsi_device_lookup_by_target(starget, lun);
1049 if (rescan || !scsi_device_created(sdev)) {
1050 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1051 "scsi scan: device exists on %s\n",
1052 dev_name(&sdev->sdev_gendev)));
1056 scsi_device_put(sdev);
1059 *bflagsp = scsi_get_device_flags(sdev,
1062 return SCSI_SCAN_LUN_PRESENT;
1064 scsi_device_put(sdev);
1066 sdev = scsi_alloc_sdev(starget, lun, hostdata);
1070 result = kmalloc(result_len, GFP_ATOMIC |
1071 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
1075 if (scsi_probe_lun(sdev, result, result_len, &bflags))
1076 goto out_free_result;
1081 * result contains valid SCSI INQUIRY data.
1083 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
1085 * For a Peripheral qualifier 3 (011b), the SCSI
1086 * spec says: The device server is not capable of
1087 * supporting a physical device on this logical
1090 * For disks, this implies that there is no
1091 * logical disk configured at sdev->lun, but there
1092 * is a target id responding.
1094 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1095 " peripheral qualifier of 3, device not"
1098 SCSI_LOG_SCAN_BUS(1, {
1099 unsigned char vend[9];
1100 unsigned char mod[17];
1102 sdev_printk(KERN_INFO, sdev,
1103 "scsi scan: consider passing scsi_mod."
1104 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1105 scsi_inq_str(vend, result, 8, 16),
1106 scsi_inq_str(mod, result, 16, 32));
1111 res = SCSI_SCAN_TARGET_PRESENT;
1112 goto out_free_result;
1116 * Some targets may set slight variations of PQ and PDT to signal
1117 * that no LUN is present, so don't add sdev in these cases.
1118 * Two specific examples are:
1119 * 1) NetApp targets: return PQ=1, PDT=0x1f
1120 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1121 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1124 * 1) SCSI SPC-3, pp. 145-146
1125 * PQ=1: "A peripheral device having the specified peripheral
1126 * device type is not connected to this logical unit. However, the
1127 * device server is capable of supporting the specified peripheral
1128 * device type on this logical unit."
1129 * PDT=0x1f: "Unknown or no device type"
1130 * 2) USB UFI 1.0, p. 20
1131 * PDT=00h Direct-access device (floppy)
1132 * PDT=1Fh none (no FDD connected to the requested logical unit)
1134 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
1135 (result[0] & 0x1f) == 0x1f &&
1136 !scsi_is_wlun(lun)) {
1137 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1138 "scsi scan: peripheral device type"
1139 " of 31, no device added\n"));
1140 res = SCSI_SCAN_TARGET_PRESENT;
1141 goto out_free_result;
1144 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
1145 if (res == SCSI_SCAN_LUN_PRESENT) {
1146 if (bflags & BLIST_KEY) {
1148 scsi_unlock_floptical(sdev, result);
1155 if (res == SCSI_SCAN_LUN_PRESENT) {
1157 if (scsi_device_get(sdev) == 0) {
1160 __scsi_remove_device(sdev);
1161 res = SCSI_SCAN_NO_RESPONSE;
1165 __scsi_remove_device(sdev);
1171 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1172 * @starget: pointer to target structure to scan
1173 * @bflags: black/white list flag for LUN 0
1174 * @scsi_level: Which version of the standard does this device adhere to
1175 * @rescan: passed to scsi_probe_add_lun()
1178 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1179 * scanned) to some maximum lun until a LUN is found with no device
1180 * attached. Use the bflags to figure out any oddities.
1182 * Modifies sdevscan->lun.
1184 static void scsi_sequential_lun_scan(struct scsi_target *starget,
1185 int bflags, int scsi_level, int rescan)
1187 unsigned int sparse_lun, lun, max_dev_lun;
1188 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1190 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1191 "%s\n", dev_name(&starget->dev)));
1193 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1195 * If this device is known to support sparse multiple units,
1196 * override the other settings, and scan all of them. Normally,
1197 * SCSI-3 devices should be scanned via the REPORT LUNS.
1199 if (bflags & BLIST_SPARSELUN) {
1200 max_dev_lun = shost->max_lun;
1206 * If less than SCSI_1_CSS, and no special lun scaning, stop
1207 * scanning; this matches 2.4 behaviour, but could just be a bug
1208 * (to continue scanning a SCSI_1_CSS device).
1210 * This test is broken. We might not have any device on lun0 for
1211 * a sparselun device, and if that's the case then how would we
1212 * know the real scsi_level, eh? It might make sense to just not
1213 * scan any SCSI_1 device for non-0 luns, but that check would best
1214 * go into scsi_alloc_sdev() and just have it return null when asked
1215 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1217 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1218 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1223 * If this device is known to support multiple units, override
1224 * the other settings, and scan all of them.
1226 if (bflags & BLIST_FORCELUN)
1227 max_dev_lun = shost->max_lun;
1229 * REGAL CDC-4X: avoid hang after LUN 4
1231 if (bflags & BLIST_MAX5LUN)
1232 max_dev_lun = min(5U, max_dev_lun);
1234 * Do not scan SCSI-2 or lower device past LUN 7, unless
1237 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1238 max_dev_lun = min(8U, max_dev_lun);
1241 * Stop scanning at 255 unless BLIST_SCSI3LUN
1243 if (!(bflags & BLIST_SCSI3LUN))
1244 max_dev_lun = min(256U, max_dev_lun);
1247 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1248 * until we reach the max, or no LUN is found and we are not
1251 for (lun = 1; lun < max_dev_lun; ++lun)
1252 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1253 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1259 * scsilun_to_int - convert a scsi_lun to an int
1260 * @scsilun: struct scsi_lun to be converted.
1263 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1264 * integer, and return the result. The caller must check for
1265 * truncation before using this function.
1268 * The struct scsi_lun is assumed to be four levels, with each level
1269 * effectively containing a SCSI byte-ordered (big endian) short; the
1270 * addressing bits of each level are ignored (the highest two bits).
1271 * For a description of the LUN format, post SCSI-3 see the SCSI
1272 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1274 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1275 * the integer: 0x0b030a04
1277 int scsilun_to_int(struct scsi_lun *scsilun)
1283 for (i = 0; i < sizeof(lun); i += 2)
1284 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1285 scsilun->scsi_lun[i + 1]) << (i * 8));
1288 EXPORT_SYMBOL(scsilun_to_int);
1291 * int_to_scsilun - reverts an int into a scsi_lun
1292 * @lun: integer to be reverted
1293 * @scsilun: struct scsi_lun to be set.
1296 * Reverts the functionality of the scsilun_to_int, which packed
1297 * an 8-byte lun value into an int. This routine unpacks the int
1298 * back into the lun value.
1299 * Note: the scsilun_to_int() routine does not truly handle all
1300 * 8bytes of the lun value. This functions restores only as much
1301 * as was set by the routine.
1304 * Given an integer : 0x0b030a04, this function returns a
1305 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1308 void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1312 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1314 for (i = 0; i < sizeof(lun); i += 2) {
1315 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1316 scsilun->scsi_lun[i+1] = lun & 0xFF;
1320 EXPORT_SYMBOL(int_to_scsilun);
1323 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1324 * @starget: which target
1325 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1326 * @rescan: nonzero if we can skip code only needed on first scan
1329 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1330 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1332 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1333 * LUNs even if it's older than SCSI-3.
1334 * If BLIST_NOREPORTLUN is set, return 1 always.
1335 * If BLIST_NOLUN is set, return 0 always.
1336 * If starget->no_report_luns is set, return 1 always.
1339 * 0: scan completed (or no memory, so further scanning is futile)
1340 * 1: could not scan with REPORT LUN
1342 static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
1346 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1347 unsigned int length;
1349 unsigned int num_luns;
1350 unsigned int retries;
1352 struct scsi_lun *lunp, *lun_data;
1354 struct scsi_sense_hdr sshdr;
1355 struct scsi_device *sdev;
1356 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
1360 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1361 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1362 * support more than 8 LUNs.
1363 * Don't attempt if the target doesn't support REPORT LUNS.
1365 if (bflags & BLIST_NOREPORTLUN)
1367 if (starget->scsi_level < SCSI_2 &&
1368 starget->scsi_level != SCSI_UNKNOWN)
1370 if (starget->scsi_level < SCSI_3 &&
1371 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
1373 if (bflags & BLIST_NOLUN)
1375 if (starget->no_report_luns)
1378 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1379 sdev = scsi_alloc_sdev(starget, 0, NULL);
1382 if (scsi_device_get(sdev)) {
1383 __scsi_remove_device(sdev);
1388 sprintf(devname, "host %d channel %d id %d",
1389 shost->host_no, sdev->channel, sdev->id);
1392 * Allocate enough to hold the header (the same size as one scsi_lun)
1393 * plus the max number of luns we are requesting.
1395 * Reallocating and trying again (with the exact amount we need)
1396 * would be nice, but then we need to somehow limit the size
1397 * allocated based on the available memory and the limits of
1398 * kmalloc - we don't want a kmalloc() failure of a huge value to
1399 * prevent us from finding any LUNs on this target.
1401 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1402 lun_data = kmalloc(length, GFP_ATOMIC |
1403 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
1405 printk(ALLOC_FAILURE_MSG, __func__);
1409 scsi_cmd[0] = REPORT_LUNS;
1412 * bytes 1 - 5: reserved, set to zero.
1414 memset(&scsi_cmd[1], 0, 5);
1417 * bytes 6 - 9: length of the command.
1419 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1420 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1421 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1422 scsi_cmd[9] = (unsigned char) length & 0xff;
1424 scsi_cmd[10] = 0; /* reserved */
1425 scsi_cmd[11] = 0; /* control */
1428 * We can get a UNIT ATTENTION, for example a power on/reset, so
1429 * retry a few times (like sd.c does for TEST UNIT READY).
1430 * Experience shows some combinations of adapter/devices get at
1431 * least two power on/resets.
1433 * Illegal requests (for devices that do not support REPORT LUNS)
1434 * should come through as a check condition, and will not generate
1437 for (retries = 0; retries < 3; retries++) {
1438 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1439 " REPORT LUNS to %s (try %d)\n", devname,
1442 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
1443 lun_data, length, &sshdr,
1444 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
1446 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
1447 " %s (try %d) result 0x%x\n", result
1448 ? "failed" : "successful", retries, result));
1451 else if (scsi_sense_valid(&sshdr)) {
1452 if (sshdr.sense_key != UNIT_ATTENTION)
1459 * The device probably does not support a REPORT LUN command
1466 * Get the length from the first four bytes of lun_data.
1468 data = (u8 *) lun_data->scsi_lun;
1469 length = ((data[0] << 24) | (data[1] << 16) |
1470 (data[2] << 8) | (data[3] << 0));
1472 num_luns = (length / sizeof(struct scsi_lun));
1473 if (num_luns > max_scsi_report_luns) {
1474 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1475 " of %d luns reported, try increasing"
1476 " max_scsi_report_luns.\n", devname,
1477 max_scsi_report_luns, num_luns);
1478 num_luns = max_scsi_report_luns;
1481 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1482 "scsi scan: REPORT LUN scan\n"));
1485 * Scan the luns in lun_data. The entry at offset 0 is really
1486 * the header, so start at 1 and go up to and including num_luns.
1488 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1489 lun = scsilun_to_int(lunp);
1492 * Check if the unused part of lunp is non-zero, and so
1493 * does not fit in lun.
1495 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1499 * Output an error displaying the LUN in byte order,
1500 * this differs from what linux would print for the
1501 * integer LUN value.
1503 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1504 data = (char *)lunp->scsi_lun;
1505 for (i = 0; i < sizeof(struct scsi_lun); i++)
1506 printk("%02x", data[i]);
1507 printk(" has a LUN larger than currently supported.\n");
1508 } else if (lun > sdev->host->max_lun) {
1509 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1510 " than allowed by the host adapter\n",
1515 res = scsi_probe_and_add_lun(starget,
1516 lun, NULL, NULL, rescan, NULL);
1517 if (res == SCSI_SCAN_NO_RESPONSE) {
1519 * Got some results, but now none, abort.
1521 sdev_printk(KERN_ERR, sdev,
1522 "Unexpected response"
1523 " from lun %d while scanning, scan"
1533 scsi_device_put(sdev);
1534 if (scsi_device_created(sdev))
1536 * the sdev we used didn't appear in the report luns scan
1538 __scsi_remove_device(sdev);
1542 struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1543 uint id, uint lun, void *hostdata)
1545 struct scsi_device *sdev = ERR_PTR(-ENODEV);
1546 struct device *parent = &shost->shost_gendev;
1547 struct scsi_target *starget;
1549 if (strncmp(scsi_scan_type, "none", 4) == 0)
1550 return ERR_PTR(-ENODEV);
1552 starget = scsi_alloc_target(parent, channel, id);
1554 return ERR_PTR(-ENOMEM);
1555 scsi_autopm_get_target(starget);
1557 mutex_lock(&shost->scan_mutex);
1558 if (!shost->async_scan)
1559 scsi_complete_async_scans();
1561 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1562 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
1563 scsi_autopm_put_host(shost);
1565 mutex_unlock(&shost->scan_mutex);
1566 scsi_autopm_put_target(starget);
1568 * paired with scsi_alloc_target(). Target will be destroyed unless
1569 * scsi_probe_and_add_lun made an underlying device visible
1571 scsi_target_reap(starget);
1572 put_device(&starget->dev);
1576 EXPORT_SYMBOL(__scsi_add_device);
1578 int scsi_add_device(struct Scsi_Host *host, uint channel,
1579 uint target, uint lun)
1581 struct scsi_device *sdev =
1582 __scsi_add_device(host, channel, target, lun, NULL);
1584 return PTR_ERR(sdev);
1586 scsi_device_put(sdev);
1589 EXPORT_SYMBOL(scsi_add_device);
1591 void scsi_rescan_device(struct device *dev)
1593 struct scsi_driver *drv;
1598 drv = to_scsi_driver(dev->driver);
1599 if (try_module_get(drv->owner)) {
1602 module_put(drv->owner);
1605 EXPORT_SYMBOL(scsi_rescan_device);
1607 static void __scsi_scan_target(struct device *parent, unsigned int channel,
1608 unsigned int id, unsigned int lun, int rescan)
1610 struct Scsi_Host *shost = dev_to_shost(parent);
1613 struct scsi_target *starget;
1615 if (shost->this_id == id)
1617 * Don't scan the host adapter
1621 starget = scsi_alloc_target(parent, channel, id);
1624 scsi_autopm_get_target(starget);
1626 if (lun != SCAN_WILD_CARD) {
1628 * Scan for a specific host/chan/id/lun.
1630 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1635 * Scan LUN 0, if there is some response, scan further. Ideally, we
1636 * would not configure LUN 0 until all LUNs are scanned.
1638 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1639 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1640 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
1642 * The REPORT LUN did not scan the target,
1643 * do a sequential scan.
1645 scsi_sequential_lun_scan(starget, bflags,
1646 starget->scsi_level, rescan);
1650 scsi_autopm_put_target(starget);
1652 * paired with scsi_alloc_target(): determine if the target has
1653 * any children at all and if not, nuke it
1655 scsi_target_reap(starget);
1657 put_device(&starget->dev);
1661 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1662 * @parent: host to scan
1663 * @channel: channel to scan
1664 * @id: target id to scan
1665 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1666 * @rescan: passed to LUN scanning routines
1669 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1670 * and possibly all LUNs on the target id.
1672 * First try a REPORT LUN scan, if that does not scan the target, do a
1673 * sequential scan of LUNs on the target id.
1675 void scsi_scan_target(struct device *parent, unsigned int channel,
1676 unsigned int id, unsigned int lun, int rescan)
1678 struct Scsi_Host *shost = dev_to_shost(parent);
1680 if (strncmp(scsi_scan_type, "none", 4) == 0)
1683 mutex_lock(&shost->scan_mutex);
1684 if (!shost->async_scan)
1685 scsi_complete_async_scans();
1687 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1688 __scsi_scan_target(parent, channel, id, lun, rescan);
1689 scsi_autopm_put_host(shost);
1691 mutex_unlock(&shost->scan_mutex);
1693 EXPORT_SYMBOL(scsi_scan_target);
1695 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1696 unsigned int id, unsigned int lun, int rescan)
1700 if (id == SCAN_WILD_CARD)
1701 for (id = 0; id < shost->max_id; ++id) {
1703 * XXX adapter drivers when possible (FCP, iSCSI)
1704 * could modify max_id to match the current max,
1705 * not the absolute max.
1707 * XXX add a shost id iterator, so for example,
1708 * the FC ID can be the same as a target id
1709 * without a huge overhead of sparse id's.
1711 if (shost->reverse_ordering)
1713 * Scan from high to low id.
1715 order_id = shost->max_id - id - 1;
1718 __scsi_scan_target(&shost->shost_gendev, channel,
1719 order_id, lun, rescan);
1722 __scsi_scan_target(&shost->shost_gendev, channel,
1726 int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1727 unsigned int id, unsigned int lun, int rescan)
1729 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1731 __func__, channel, id, lun));
1733 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1734 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1735 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1738 mutex_lock(&shost->scan_mutex);
1739 if (!shost->async_scan)
1740 scsi_complete_async_scans();
1742 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1743 if (channel == SCAN_WILD_CARD)
1744 for (channel = 0; channel <= shost->max_channel;
1746 scsi_scan_channel(shost, channel, id, lun,
1749 scsi_scan_channel(shost, channel, id, lun, rescan);
1750 scsi_autopm_put_host(shost);
1752 mutex_unlock(&shost->scan_mutex);
1757 static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1759 struct scsi_device *sdev;
1760 shost_for_each_device(sdev, shost) {
1761 /* target removed before the device could be added */
1762 if (sdev->sdev_state == SDEV_DEL)
1764 if (!scsi_host_scan_allowed(shost) ||
1765 scsi_sysfs_add_sdev(sdev) != 0)
1766 __scsi_remove_device(sdev);
1771 * scsi_prep_async_scan - prepare for an async scan
1772 * @shost: the host which will be scanned
1773 * Returns: a cookie to be passed to scsi_finish_async_scan()
1775 * Tells the midlayer this host is going to do an asynchronous scan.
1776 * It reserves the host's position in the scanning list and ensures
1777 * that other asynchronous scans started after this one won't affect the
1778 * ordering of the discovered devices.
1780 static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
1782 struct async_scan_data *data;
1783 unsigned long flags;
1785 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1788 if (shost->async_scan) {
1789 printk("%s called twice for host %d", __func__,
1795 data = kmalloc(sizeof(*data), GFP_KERNEL);
1798 data->shost = scsi_host_get(shost);
1801 init_completion(&data->prev_finished);
1803 mutex_lock(&shost->scan_mutex);
1804 spin_lock_irqsave(shost->host_lock, flags);
1805 shost->async_scan = 1;
1806 spin_unlock_irqrestore(shost->host_lock, flags);
1807 mutex_unlock(&shost->scan_mutex);
1809 spin_lock(&async_scan_lock);
1810 if (list_empty(&scanning_hosts))
1811 complete(&data->prev_finished);
1812 list_add_tail(&data->list, &scanning_hosts);
1813 spin_unlock(&async_scan_lock);
1823 * scsi_finish_async_scan - asynchronous scan has finished
1824 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1826 * All the devices currently attached to this host have been found.
1827 * This function announces all the devices it has found to the rest
1830 static void scsi_finish_async_scan(struct async_scan_data *data)
1832 struct Scsi_Host *shost;
1833 unsigned long flags;
1838 shost = data->shost;
1840 mutex_lock(&shost->scan_mutex);
1842 if (!shost->async_scan) {
1843 printk("%s called twice for host %d", __func__,
1846 mutex_unlock(&shost->scan_mutex);
1850 wait_for_completion(&data->prev_finished);
1852 scsi_sysfs_add_devices(shost);
1854 spin_lock_irqsave(shost->host_lock, flags);
1855 shost->async_scan = 0;
1856 spin_unlock_irqrestore(shost->host_lock, flags);
1858 mutex_unlock(&shost->scan_mutex);
1860 spin_lock(&async_scan_lock);
1861 list_del(&data->list);
1862 if (!list_empty(&scanning_hosts)) {
1863 struct async_scan_data *next = list_entry(scanning_hosts.next,
1864 struct async_scan_data, list);
1865 complete(&next->prev_finished);
1867 spin_unlock(&async_scan_lock);
1869 scsi_autopm_put_host(shost);
1870 scsi_host_put(shost);
1874 static void do_scsi_scan_host(struct Scsi_Host *shost)
1876 if (shost->hostt->scan_finished) {
1877 unsigned long start = jiffies;
1878 if (shost->hostt->scan_start)
1879 shost->hostt->scan_start(shost);
1881 while (!shost->hostt->scan_finished(shost, jiffies - start))
1884 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1889 static void do_scan_async(void *_data, async_cookie_t c)
1891 struct async_scan_data *data = _data;
1892 struct Scsi_Host *shost = data->shost;
1894 do_scsi_scan_host(shost);
1895 scsi_finish_async_scan(data);
1899 * scsi_scan_host - scan the given adapter
1900 * @shost: adapter to scan
1902 void scsi_scan_host(struct Scsi_Host *shost)
1904 struct async_scan_data *data;
1906 if (strncmp(scsi_scan_type, "none", 4) == 0)
1908 if (scsi_autopm_get_host(shost) < 0)
1911 data = scsi_prep_async_scan(shost);
1913 do_scsi_scan_host(shost);
1914 scsi_autopm_put_host(shost);
1918 /* register with the async subsystem so wait_for_device_probe()
1919 * will flush this work
1921 async_schedule(do_scan_async, data);
1923 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1925 EXPORT_SYMBOL(scsi_scan_host);
1927 void scsi_forget_host(struct Scsi_Host *shost)
1929 struct scsi_device *sdev;
1930 unsigned long flags;
1933 spin_lock_irqsave(shost->host_lock, flags);
1934 list_for_each_entry(sdev, &shost->__devices, siblings) {
1935 if (sdev->sdev_state == SDEV_DEL)
1937 spin_unlock_irqrestore(shost->host_lock, flags);
1938 __scsi_remove_device(sdev);
1941 spin_unlock_irqrestore(shost->host_lock, flags);
1945 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1946 * @shost: Host that needs a scsi_device
1948 * Lock status: None assumed.
1950 * Returns: The scsi_device or NULL
1953 * Attach a single scsi_device to the Scsi_Host - this should
1954 * be made to look like a "pseudo-device" that points to the
1957 * Note - this device is not accessible from any high-level
1958 * drivers (including generics), which is probably not
1959 * optimal. We can add hooks later to attach.
1961 struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1963 struct scsi_device *sdev = NULL;
1964 struct scsi_target *starget;
1966 mutex_lock(&shost->scan_mutex);
1967 if (!scsi_host_scan_allowed(shost))
1969 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1973 sdev = scsi_alloc_sdev(starget, 0, NULL);
1977 scsi_target_reap(starget);
1978 put_device(&starget->dev);
1980 mutex_unlock(&shost->scan_mutex);
1983 EXPORT_SYMBOL(scsi_get_host_dev);
1986 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1987 * @sdev: Host device to be freed
1989 * Lock status: None assumed.
1993 void scsi_free_host_dev(struct scsi_device *sdev)
1995 BUG_ON(sdev->id != sdev->host->this_id);
1997 __scsi_remove_device(sdev);
1999 EXPORT_SYMBOL(scsi_free_host_dev);